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Ceanothus: Taxonomic patterns in life history responses to fire. | LitMetric

AI Article Synopsis

  • Ceanothus is a diverse genus of shrubs found in California chaparral, showing resilience to fires through either resprouting or reliance on dormant seeds for recruitment.
  • *Research involved analyzing existing literature and conducting extensive field studies on over 60 wildfires in California to understand species responses to fire.
  • *The findings indicate that Ceanothus species largely resprout, while Cerastes species are primarily obligate seeders, particularly in California, where this seeding strategy evolved due to the region's predictable fire patterns.

Article Abstract

Premise: Ceanothus (Rhamnaceae) is a large genus of shrubs that dominate California chaparral and are resilient to fires. Persistence is ensured by resprouting and/or seedling recruitment from dormant seed banks. Some species do both and others, the obligate seeders, are entirely dependent on seedling recruitment. The distribution of these two modes within the genus is poorly documented.

Methods: We used all available publications that document species responses to fire and filled most gaps in the literature based on extensive field studies of more than 60 recent wildfires in California.

Results: The genus is divided into two subgenera, Ceanothus and Cerastes. Ceanothus is widely considered to comprise mostly resprouting species and Cerastes to consist of only obligate seeders. The subgenus Ceanothus includes resprouting species throughout their range from the eastern United States and Midwest to western United States. Within the California Floristic Province (CFP), a few species are unique in producing massive lignotubers that develop from repeated fires; however, within the CFP, the majority of species in this subgenus do not resprout and are obligate seeders. Two have disjunct subspecies that are facultative seeders or obligate seeders.

Conclusions: Previously, speciation in this genus was contended to have occurred in the late Miocene within the CFP. The syndrome of obligate seeding is most strongly represented in this region, and we hypothesize that evolution of this syndrome was a response to increased predictability of fire driven by the Mediterranean climate and the long interval between fires.

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Source
http://dx.doi.org/10.1002/ajb2.16434DOI Listing

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